Error exporting to temp buffer

[Leo <sdl.web@gmail.com>]

Hi there,

Put the following sample in a buffer *not* visiting any file and try
`C-c C-e H' to get the back trace. It is reproducible in GNU Emacs
23.0.91.1 (i386-mingw-nt5.1.2600) of 2009-02-28 on BREPNB with orgmode
6.21b.

Sample:
--------------------------------

*good* is /already/ very _important_. But http://www.google.com is not the
right place.

--------------------------------

,----[ Backtrace ]
| Debugger entered--Lisp error: (wrong-type-argument stringp nil)
|   file-name-nondirectory(nil)
|   org-export-html-preprocess((:emph-multiline t :for-html t :skip-before-1st-heading nil :drawers nil :todo-keywords t :tags not-in-toc :priority nil :footnotes t :timestamps t :archived-trees headline :select-tags ("export") :exclude-tags ("noexport") :add-text nil :LaTeX-fragments t))
|   org-export-preprocess-string(#("*good* is /already/ very _important_. But http://www.google.com is not the\nright place." 0 1 (fontified nil :org-license-to-kill t face (bold) font-lock-multiline t invisible org-link) 1 5 (fontified nil :org-license-to-kill t face (bold) font-lock-multiline t) 5 6 (fontified nil :org-license-to-kill t face (bold) font-lock-multiline t invisible org-link mouse-face highlight keymap (keymap ... ... ... ... ...)) 6 7 (fontified nil :org-license-to-kill t mouse-face highlight keymap (keymap ... ... ... ... ...)) 7 10 (fontified nil :org-license-to-kill t) 10 11 (fontified nil :org-license-to-kill t face (italic) font-lock-multiline t invisible org-link) 11 18 (fontified nil :org-license-to-kill t face (italic) font-lock-multiline t) 18 19 (fontified nil :org-license-to-kill t face (italic) font-lock-multiline t invisible org-link) 19 25 (fontified nil :org-license-to-kill t) 25 26 (fontified nil :org-license-to-kill t face (underline) font-lock-multiline t invisible org-link) 26 35 (fontified nil :org-license-to-kill t face (underline) font-lock-multiline t) 35 36 (fontified nil :org-license-to-kill t face (underline) font-lock-multiline t invisible org-link) 36 42 (fontified nil :org-license-to-kill t) 42 47 (fontified nil rear-nonsticky (mouse-face highlight keymap invisible intangible help-echo org-linked-text) :org-license-to-kill t mouse-face highlight keymap (keymap ... ... ... ... ...) face org-link) 47 48 (fontified nil rear-nonsticky (mouse-face highlight keymap invisible intangible help-echo org-linked-text) :org-license-to-kill t mouse-face highlight keymap (keymap ... ... ... ... ...) face org-link) 48 49 (fontified nil rear-nonsticky (mouse-face highlight keymap invisible intangible help-echo org-linked-text) :org-license-to-kill t mouse-face highlight keymap (keymap ... ... ... ... ...) face org-link) 49 63 (fontified nil rear-nonsticky (mouse-face highlight keymap invisible intangible help-echo org-linked-text) :org-license-to-kill t mouse-face highlight keymap (keymap ... ... ... ... ...) face org-link) 63 75 (fontified nil :org-license-to-kill t) 75 87 (fontified nil)) :emph-multiline t :for-html t :skip-before-1st-heading nil :drawers nil :todo-keywords t :tags not-in-toc :priority nil :footnotes t :timestamps t :archived-trees headline :select-tags ("export") :exclude-tags ("noexport") :add-text nil :LaTeX-fragments t)
|   org-export-as-html(nil nil nil "*Org HTML Export*")
|   org-export-as-html-to-buffer(nil)
|   call-interactively(org-export-as-html-to-buffer)
|   org-export(nil)
|   call-interactively(org-export nil nil)
`----

Best,
-- 
.: Leo :. [ sdl.web AT gmail.com ] .: I use Emacs :.